General This standard is applicable to
stationary atmospheric and low-pressure (up to and including 15
psig) aboveground petroleum storage tanks used in all sectors of
the petroleum and petrochemical industry, including:

— crude oil and gas production,

— refining,

— petrochemicals,

— pipelines and terminals,

— bulk storage,

— ethanol facilities.

This standard provides requirements for safely planning,
coordinating, and conducting tank entry and cleaning operations,
from removal from service through return to service.

This standard does not and cannot cover every possible unique
hazard or situation that may arise during tank cleaning operations.
Site, product, and tank-specific hazards and situations must be
addressed by employers using the appropriate principles and
considerations provided for by this standard.

Non-applicability and Other Tank Cleaning
Applications

This standard does not apply to the following types of tanks or
vessels:

— pressure vessels and pressurized tanks exceeding 15 psig,

— cryogenic or refrigerated vessels or pressure tanks,

— vessels and tanks maintained under a vacuum,

— process vessels,

— underground storage tanks.

Although API Standard 2015 is not intended to cover these types
of tanks and vessels, many of the safe tank cleaning and entry
principles and requirements in this standard apply and should be
considered.